Safeguarding the past, present and future of RISC OS for everyone

Using the full screen size of HDMI screen

5 posts, 4 voices

Mar 19, 2014 9:52pm Garry (87) 184 posts	Hello, I bought a Philips ‘E-Line’ HDMI screen, model number 247E4. My Raspberry Pi is connected to one of the HDMI sockets, and I have it set to ‘Generic’ at 1920×1080. The RISC OS desktop shows up, but with a 2cm blank/black border around it. So basically RISC OS is not using the whole screen. It’s not the end of the work, as it’s a 23" screen, so that still leaves a pretty big desktop, but I’d like to fix if I can. Any ideas? Cheers Garry

Mar 19, 2014 9:58pm Steve Pampling (1551) 8170 posts	My Raspberry Pi is connected to one of the HDMI sockets, and I have it set to ‘Generic’ at 1920×1080. The RISC OS desktop shows up, but with a 2cm blank/black border around it. So basically RISC OS is not using the whole screen. It’s not the end of the work, as it’s a 23" screen, so that still leaves a pretty big desktop, but I’d like to fix if I can. Any ideas? IIRC the black border issue is often down to the versions of the Pi firmware in use. I don’t know whether AnyMode is of any use here, certainly worth loading for the ability to quickly swap modes to pretty much anything you can think of

Mar 19, 2014 10:36pm John Sandgrounder (1650) 574 posts	There is something in the Raspberry Pi build for RISCOS (hardware/firmware/software) which ‘remembers’ the screen used when the system boots for the first time. Try using a clean build of RISCOS (one never booted before). That works for me and I now get a nice 1920×1080 desktop which uses the the whole monitor. But, if I move a RISCOS Raspberry Pi from one monitor to another, then I get all sorts of desktop sizes/resolutions, with black borders on one or more edges.

Mar 20, 2014 12:55am Andrew Conroy (370) 740 posts	The RISC OS desktop shows up, but with a 2cm blank/black border around it. You might need to change the overscan settings, by adding the line: disable_overscan=1 to your config.txt file inside !Boot.Loader You can also set the top, bottom, left & right overscan borders independently using overscan_top=10 (or whatever value works) etc. See http://elinux.org/RPiconfig for more details on other display settings you can change.

Mar 21, 2014 2:59am Garry (87) 184 posts	It was the disable_overscan wot won it. I made the change, and now my screen looks perfect. Thanks a lot. Clear as a bell.